Intense rainfalls prediction models for the state of Mato Grosso, Brazil

• Main Authors: Sidney Pereira, Marcelo Ribeiro Viola, Nara Rúbia de Morais, Luiz Fernando Coutinho
• Format: Article
• Language: English
• Published: Instituto de Pesquisas Ambientais em Bacias Hidrográficas (IPABHi) 2011-12-01
• Series: Revista Ambiente & Água
• Subjects: rainfall; Bell’s model; intensity-duration-frequency
• Online Access: http://www.ambi-agua.net/seer/index.php/ambi-agua/article/view/553

Rain intensity data are necessary to increase security of hydraulic projects. The objective of this study was to determine the relationships among intensity-duration-frequency (IDF) and Bell’s model for the State of Mato Grosso, Brazil. The equations were obtained by disaggregation of 24 h rainfall data from 136 rain stations available in the National Water Agency (ANA) data base. Employing Gumbel distribution, the rainfalls were estimated for each time duration and for the return periods of 2, 5, 10, 25, 50 and 100 years, and thereafter for each season. The coefficients of IDF relationships and Bell’s models were adjusted by the minimum square method, for all seasons evaluated. The coefficients of determination and Willmott agreement index exceeded 0.98 and 0.85, respectively, for all stations, which classifies the adjustment of the rainfall models as great.